Question

Conductive shields against static, quasistatic or low frequency magnetic fields?

Answer 1



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AC Magnetic Field

AC magnetic field is generated when an alternating current is passing through a coil. The AC current is a time-varying current and it is often a sine-wave. Thus, the magnetic is also time-varying. There are several techniques for generating high-frequency magnetic field as discussed below. The magnetic field intensity or strength is depended on the alternating current. Therefore high-current is needed to produce high AC magnetic field.

An AC current driver such as the TS200 and the TS250 can output many amperes of current through an AC magnetic coil to produce the electromagnetic field. The TS20/TS250 can drive coils such an AC Helmholtz coil pair directly. This called the direct-drive method as discussed below. High current can be driven through the coil as shown in Figure 1.

Alternating Magnetic Field Driver Waveform Examples

Figure 2. TS250-0 outputs 12App (+/-6A) current for generating alternating electromagnetic field. The TS250 output voltage is 12Vpp with 1 ohm load or 12App.



Figure 1. The TS250 driver amplifies current and drives a magnetic coil to produce AC magnetic field.

AC Magnetic Field Generation Diagram